<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>粒子随心动画</title>
    <script src="http://cdn.sucai8.cn/cdn/jquery/jquery-1.10.2.js"></script>
    <style>
      body {
        overflow: hidden;
        margin: 0;
      }
 
      .twitter:hover a {
        transform: rotate(-45deg) scale(1.05);
      }
      .twitter:hover i {
        color: #21c2ff;
      }
      .twitter a {
        bottom: -40px;
        right: -75px;
        transform: rotate(-45deg);
      }
      .twitter i {
        bottom: 7px;
        right: 7px;
        color: #00aced;
      }
 
      .social-icon a {
        position: absolute;
        background: white;
        color: white;
        box-shadow: -1px -1px 20px 0px rgba(0, 0, 0, 0.3);
        display: inline-block;
        width: 150px;
        height: 80px;
        transform-origin: 50% 50%;
        transition: 0.15s ease-out;
      }
      .social-icon i {
        position: absolute;
        pointer-events: none;
        z-index: 1000;
        transition: 0.15s ease-out;
      }
 
      .youtube:hover a {
        transform: rotate(45deg) scale(1.05);
      }
      .youtube:hover i {
        color: #ec4c44;
      }
      .youtube a {
        bottom: -40px;
        left: -75px;
        transform: rotate(45deg);
      }
      .youtube i {
        bottom: 7px;
        left: 7px;
        color: #e62117;
      }
    </style>
  </head>
  <body>
    <canvas></canvas>
 
    <script>
      "use strict";
 
      var canvas = document.querySelector("canvas");
      var c = canvas.getContext("2d");
 
      canvas.width = innerWidth;
      canvas.height = innerHeight;
 
      var mouse = {
        x: innerWidth / 2,
        y: innerHeight / 2 - 80,
      };
 
      var colors = ["#00bdff", "#4d39ce", "#088eff"];
 
      addEventListener("mousemove", function (event) {
        mouse.x = event.clientX;
        mouse.y = event.clientY;
      });
 
      addEventListener("resize", function () {
        canvas.width = innerWidth;
        canvas.height = innerHeight;
 
        init();
      });
 
      function randomIntFromRange(min, max) {
        return Math.floor(Math.random() * (max - min + 1) + min);
      }
 
      function randomColor(colors) {
        return colors[Math.floor(Math.random() * colors.length)];
      }
 
      function Particle(x, y, radius, color) {
        var _this = this;
 
        var distance = randomIntFromRange(50, 120);
        this.x = x;
        this.y = y;
        this.radius = radius;
        this.color = color;
        this.radians = Math.random() * Math.PI * 2;
        this.velocity = 0.05;
        this.distanceFromCenter = {
          x: distance,
          y: distance,
        };
        this.prevDistanceFromCenter = {
          x: distance,
          y: distance,
        };
        this.lastMouse = { x: x, y: y };
 
        this.update = function () {
          var lastPoint = { x: _this.x, y: _this.y };
          _this.radians += _this.velocity;
 
          _this.lastMouse.x += (mouse.x - _this.lastMouse.x) * 0.05;
          _this.lastMouse.y += (mouse.y - _this.lastMouse.y) * 0.05;
 
          _this.distanceFromCenter.x =
            _this.prevDistanceFromCenter.x + Math.sin(_this.radians) * 100;
          _this.distanceFromCenter.y =
            _this.prevDistanceFromCenter.x + Math.sin(_this.radians) * 100;
 
          _this.x =
            _this.lastMouse.x +
            Math.cos(_this.radians) * _this.distanceFromCenter.x;
          _this.y =
            _this.lastMouse.y +
            Math.sin(_this.radians) * _this.distanceFromCenter.y;
 
          _this.draw(lastPoint);
        };
 
        this.draw = function (lastPoint) {
          c.beginPath();
          c.strokeStyle = _this.color;
          c.lineWidth = _this.radius;
          c.moveTo(lastPoint.x, lastPoint.y);
          c.lineTo(_this.x, _this.y);
          c.stroke();
          c.closePath();
        };
      }
 
      var particles = undefined;
      function init() {
        particles = [];
 
        for (var i = 0; i < 50; i++) {
          var radius = Math.random() * 2 + 1;
          particles.push(
            new Particle(
              canvas.width / 2,
              canvas.height / 2,
              radius,
              randomColor(colors)
            )
          );
        }
      }
 
      function animate() {
        requestAnimationFrame(animate);
        c.fillStyle = "rgba(255, 255, 255, 0.05)";
        c.fillRect(0, 0, canvas.width, canvas.height);
 
        particles.forEach(function (particle) {
          particle.update();
        });
      }
 
      init();
      animate();
    </script>
  </body>
</html>
 
